from __future__ import annotations

import argparse
from typing import Any

import pytest

from pipdeptree._cli import EnumAction, build_parser, get_options
from pipdeptree._warning import WarningType


def test_parser_default() -> None:
    parser = build_parser()
    args = parser.parse_args([])
    assert not args.json
    assert args.output_format is None


def test_parser_j() -> None:
    parser = build_parser()
    args = parser.parse_args(["-j"])
    assert args.json
    assert args.output_format is None


def test_parser_json() -> None:
    parser = build_parser()
    args = parser.parse_args(["--json"])
    assert args.json
    assert args.output_format is None


def test_parser_json_tree() -> None:
    parser = build_parser()
    args = parser.parse_args(["--json-tree"])
    assert args.json_tree
    assert not args.json
    assert args.output_format is None


def test_parser_mermaid() -> None:
    parser = build_parser()
    args = parser.parse_args(["--mermaid"])
    assert args.mermaid
    assert not args.json
    assert args.output_format is None


def test_parser_pdf() -> None:
    parser = build_parser()
    args = parser.parse_args(["--graph-output", "pdf"])
    assert args.output_format == "pdf"
    assert not args.json


def test_parser_svg() -> None:
    parser = build_parser()
    args = parser.parse_args(["--graph-output", "svg"])
    assert args.output_format == "svg"
    assert not args.json


@pytest.mark.parametrize(
    ("should_be_error", "depth_arg", "expected_value"),
    [
        (True, ["-d", "-1"], None),
        (True, ["--depth", "string"], None),
        (False, ["-d", "0"], 0),
        (False, ["--depth", "8"], 8),
        (False, [], float("inf")),
    ],
)
def test_parser_depth(should_be_error: bool, depth_arg: list[str], expected_value: None | float) -> None:
    parser = build_parser()

    if should_be_error:
        with pytest.raises(SystemExit):
            parser.parse_args(depth_arg)
    else:
        args = parser.parse_args(depth_arg)
        assert args.depth == expected_value


@pytest.mark.parametrize(
    "args",
    [
        pytest.param(["--exclude", "py", "--all"], id="exclude-all"),
        pytest.param(["-e", "py", "--packages", "py2"], id="exclude-packages"),
        pytest.param(["-e", "py", "-p", "py2", "-a"], id="exclude-packages-all"),
    ],
)
def test_parser_get_options_exclude_combine_not_supported(args: list[str], capsys: pytest.CaptureFixture[str]) -> None:
    with pytest.raises(SystemExit, match="2"):
        get_options(args)

    out, err = capsys.readouterr()
    assert not out
    assert "cannot use --exclude with --packages or --all" in err


def test_parser_get_options_exclude_only() -> None:
    parsed_args = get_options(["--exclude", "py"])
    assert parsed_args.exclude == "py"


def test_parser_get_options_license_and_freeze_together_not_supported(capsys: pytest.CaptureFixture[str]) -> None:
    with pytest.raises(SystemExit, match="2"):
        get_options(["--license", "--freeze"])

    out, err = capsys.readouterr()
    assert not out
    assert "cannot use --license with --freeze" in err


@pytest.mark.parametrize(("bad_type"), [None, str])
def test_enum_action_type_argument(bad_type: Any) -> None:
    with pytest.raises(TypeError, match="type must be a subclass of Enum"):
        EnumAction(["--test"], "test", type=bad_type)


def test_enum_action_default_argument_not_str() -> None:
    with pytest.raises(TypeError, match="default must be defined with a string value"):
        EnumAction(["--test"], "test", type=WarningType)


def test_enum_action_default_argument_not_a_valid_choice() -> None:
    with pytest.raises(ValueError, match="default value should be among the enum choices"):
        EnumAction(["--test"], "test", type=WarningType, default="bad-warning-type")


def test_enum_action_call_with_value() -> None:
    action = EnumAction(["--test"], "test", type=WarningType, default="silence")
    namespace = argparse.Namespace()
    action(argparse.ArgumentParser(), namespace, "suppress")
    assert getattr(namespace, "test", None) == WarningType.SUPPRESS


def test_enum_action_call_without_value() -> None:
    # ensures that we end up using the default value in case no value is specified (currently we pass nargs='?' when
    # creating the --warn option, which is why this test exists)
    action = EnumAction(["--test"], "test", type=WarningType, default="silence")
    namespace = argparse.Namespace()
    action(argparse.ArgumentParser(), namespace, None)
    assert getattr(namespace, "test", None) == WarningType.SILENCE
